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乌鲁木齐及附近地区剪切波分裂特征研究
STUDY ON SHEAR-WAVE SPLIT CHARACTER IN URUMQI, XINJIANG, AND ITS ADJACENT AREA
【摘要】 利用S波分裂的方法,分析了2003年2月14日新疆石河子5.4级地震前后多台所记录的小地震的S波分裂特征,发现震源附近地区的S波分裂特征对中强震仍有一定的前兆意义。震中附近的3个地震台记录的S波偏振方向在5.4级地震前出现由原来与区域应力场一致的NE向转为NW向震后又转回NE向。5.4级地震前各台记录的慢波延迟时间总体表现出由小变大的特征。
【Abstract】 We used S-wave split method to analyze the S-wave split character of small shocks recorded by many stations before the Shihezi, Xinjiang, around M \-S5.4 earthquake on Feb. 14, 2003, and found the S-wave split character around the epicenter shown some precursor of the event. Before the shock, the S-wave polarization direction that recorded by 3 stations around the epicenter turned to NW from NE consistent with the direction of regional stress field; but after the shock, it turned to NE again. And in general, the slow wave delay time shown the feature from short to long before the earthquake.
【Key words】 S-wave split; Slow wave delay time; Fast wave polarization direction; Xinjiang;
- 【文献出处】 内陆地震 ,Inland Earthquake , 编辑部邮箱 ,2004年03期
- 【分类号】P315.3
- 【被引频次】5
- 【下载频次】45